Kwikset 91580-002 Halifax Slim Square Single Cylinder Deadbolt featuring SmartKey in Polished Chrome Designer style and superior security with this Kwikset Signature Series product For use on exterior doors where one sided keyed entry and security is needed Features SmartKey Security- Re-key your lock in 3 easy steps; Compatible with Kwikset KW1 Keyway Meets ADA/ANSI A117.1 requirements, ensuring accessibility to all disabled persons Alignment post for easy install and strengthened springs to ensure lever doesn't sag over time